World's First General Design Approval (GDA) for Developed Steel and Post-Weld Heat Treatment (PWHT) Exemption based on ECA for Low-pressure Liquefied CO₂ Tank made of KF460 steel
Tokyo, December 5, 2025 - Mitsubishi Shipbuilding Co., Ltd. (Mitsubishi Shipbuilding), a part of Mitsubishi Heavy Industries (MHI) Group, and Nippon Steel Corporation (Nippon Steel) have applied Nippon Steel's developed steel to the cargo tanks of low-pressure liquified CO2 (LCO2) carriers and have jointly developed the PWHT(Note1)-exemption technology based on ECA(Note2). Both companies have recently received the world's first General Design Approval (GDA)(Note3) from Nippon Kaiji Kyokai (ClassNK) for this technology.
machineryasia 
Tokyo, December 5, 2025 - Mitsubishi Shipbuilding Co., Ltd. (Mitsubishi Shipbuilding), a part of Mitsubishi Heavy Industries (MHI) Group, and Nippon Steel Corporation (Nippon Steel) have applied Nippon Steel's developed steel to the cargo tanks of low-pressure liquified CO2 (LCO2) carriers and have jointly developed the PWHT(Note1)-exemption technology based on ECA(Note2). Both companies have recently received the world's first General Design Approval (GDA)(Note3) from Nippon Kaiji Kyokai (ClassNK) for this technology.
